Car Loan Interest and Gig Driving: Two Deductions People Miss

GigOdo Team · Published August 20, 2026 · Every figure sourced to the IRS or the statute unless noted

Two deductions, one car loan

One car loan can produce two different deductions in 2026, and plenty of drivers claim neither. The business-use share of your interest goes on Schedule C even if you take the standard mileage rate. The personal-use share may qualify for the new $10,000 car loan interest deduction on Schedule 1-A.

These are separate rules from separate decades, and conflating them is where drivers get into trouble. One is a long-standing business expense allocation. The other is a temporary personal deduction created by the One Big Beautiful Bill Act in July 2025. They can both apply to the same loan in the same year, on different slices of the interest.

Deduction one: the business share on Schedule C

If you use the standard mileage rate, you cannot separately deduct gas, repairs, insurance or depreciation - those are baked into the rate. Interest is different. It was never one of the operating costs the rate replaces, so the business-use percentage of your car loan interest is deductible on top of your mileage.

The authority is Rev. Proc. 2019-46 section 4.03(2), and the current 2025 Instructions for Schedule C describe the same allocation in the interest rules for lines 16a and 16b. Employees get nothing here; this is a self-employment deduction, which every app-based driver filing a Schedule C line by line already is.

This deduction also does something the personal one cannot: it reduces net profit, so it cuts self-employment tax as well as income tax. Self-employment tax runs 15.3% on 92.35% of net earnings per IRS Topic 554, which is roughly 14.1 cents of extra savings per dollar deducted.

Deduction two: the new $10,000 personal deduction

Internal Revenue Code section 163(h)(4), added by the One Big Beautiful Bill Act, allows a deduction for qualified passenger vehicle loan interest for taxable years beginning after December 31, 2024 and before January 1, 2029. The statute caps the amount at $10,000 per year and does not double that figure for joint filers.

It is claimed in Part IV of the new Schedule 1-A, and the IRS confirms it is "available for both itemizing and non-itemizing taxpayers." That matters for drivers, most of whom take the standard deduction and would otherwise get no benefit from a personal interest write-off at all.

The catch is that this deduction is for interest on a vehicle bought for personal use. It is not a gig-work deduction. It is a consumer deduction that a gig worker may also happen to qualify for, and the eligibility rules are where most drivers fall out.

Which vehicles actually qualify

The vehicle test is strict and it is the reason most drivers will not clear it. The statute requires an applicable passenger vehicle whose original use commences with the taxpayer, which excludes used cars entirely, and it must have undergone final assembly in the United States.

An applicable passenger vehicle is a car, minivan, van, SUV, pickup truck or motorcycle with a gross vehicle weight rating under 14,000 pounds. Motorcycles being on that list is a genuine surprise, and relevant to two-wheel couriers who financed a new bike. The statute separately excludes fleet sales, commercial vehicles, lease financing, salvage-titled vehicles and vehicles acquired for scrap or parts.

To check final assembly, the IRS points to the vehicle information label on the car and to the National Highway Traffic Safety Administration VIN Decoder, which reports plant of manufacture. Do that before you count on the deduction, because a familiar nameplate tells you nothing about where the specific unit was built.

The 50 percent personal use test drivers should read twice

Proposed regulations published in the Federal Register on January 2, 2026 fill in what personal use means. Under those rules the taxpayer must expect, when the loan is made, that the vehicle will be used for personal purposes more than 50 percent of the time. Personal use includes use by a spouse and dependents, and commuting counts as personal.

Read that against real gig driving. A part-timer who bought a family car and delivers on weekends plausibly meets it. Someone who financed a new car specifically to run full-time delivery routes does not, and should not claim it.

Two details soften the edges. The expectation is tested once, at origination, and analysts reading the proposed rules note there is no annual recertification - so a car bought for commuting in 2025 that became a work vehicle later is judged on the original expectation. And these are proposed, not final, regulations. Confirm the position with a preparer before filing.

The income phase-out

The new deduction shrinks as income rises. It is reduced by $200 for each $1,000, or portion of $1,000, of modified adjusted gross income above $100,000, or above $200,000 on a joint return. That arithmetic zeroes it out at $150,000 single and $250,000 joint.

Computed from the statutory phase-out in 26 U.S.C. sec. 163(h)(4): $200 of reduction per $1,000 of MAGI over the threshold. Source: 26 U.S.C. sec. 163.

For most drivers this table is academic. Gig net earnings rarely approach $100,000, and the phase-out uses household MAGI, so it mainly bites two-income households where driving is the side income.

One loan, split two ways: a worked example

Say you financed $28,000 on a new, US-assembled compact in March 2026 at 7.5% over 60 months. Interest in the first twelve months runs roughly $1,900. You drive 15,000 total miles for the year and 4,500 of them are logged business miles, so business use is 30%.

The split follows the log. Thirty percent of $1,900, or $570, is business interest on Schedule C. The remaining $1,330 is personal interest, which is what the Schedule 1-A deduction is aimed at - comfortably under the $10,000 ceiling, as almost every ordinary car loan will be.

Now change one fact. Make it a full-time driver at 70% business use who bought the car to work. The Schedule C share rises to about $1,330, and the personal deduction is likely off the table because the more-than-50-percent personal use expectation is not met. The bigger deduction is the business one anyway.

Why you cannot claim the same interest twice

The anti-double-dip rule is explicit. The 2025 Schedule C instructions state that if you use your vehicle for both business and personal purposes and claimed a deduction on Schedule 1-A for vehicle loan interest allocable to your personal use, you cannot claim a deduction for that same interest on Schedule C.

The proposed regulations put the same fence around it from the other side: you may take whatever interest deductions other Code sections allow, but you may not deduct more total interest than is otherwise allowable. One dollar of interest, one deduction.

Where a driver has a choice, the business share is usually the better home for the dollars, because Schedule C interest reduces self-employment tax and income tax while Schedule 1-A reduces income tax only. That is the same logic behind the rest of the gig driver deductions beyond mileage.

The paperwork you will need

Three documents carry this deduction. The vehicle identification number has to be reported on Schedule 1-A for any year you claim the personal deduction, so keep the purchase paperwork and the window sticker that shows final assembly. Losing the VIN means losing the deduction.

Second, lenders now report it. A person receiving $600 or more of interest during the year on a specified passenger vehicle loan furnishes Form 1098-VLI, which shows the interest received and the VIN of the financed vehicle. Reporting for calendar year 2025 got transition relief under Notice 2025-57, so a 2025 claim may rest on your own loan statements.

Third, and this is the one nobody hands you: the business-use percentage. Nothing on a 1098-VLI tells the IRS what share of your driving was work. That number comes from a contemporaneous mileage log, and a mileage log that survives an audit is what turns a percentage into a defensible deduction.

Interest sits alongside mileage, not instead of it. The 2026 business standard mileage rate is 72.5 cents per mile for January through June (Notice 2026-10) and 76 cents per mile for July through December (Announcement 2026-11). Both bands are in the 2026 mileage deduction calculator.

So the 30%-business driver above is looking at roughly $3,300 of mileage deduction plus $570 of interest, and the interest costs nothing extra to claim once the log exists. If you are weighing methods, the standard mileage vs actual expenses decision guide covers the tradeoff; interest is deductible under either one.

Worth noting for anyone doing the full cost math: interest is a financing cost, not an operating cost, which is exactly why the rate does not cover it and why it never shows up in a cost-per-mile figure built from fuel and maintenance.

Who this does not help

Being straight about the losers here saves people from bad filings. Buy used and the new personal deduction is gone, no matter how new-to-you the car is. Lease and it is gone. Finance a vehicle assembled outside the United States and it is gone. Take out the loan before January 1, 2025 and it is gone.

Also gone: any version of this for W-2 employees, and any claim that the $10,000 figure is what you get back. It is a deduction from taxable income, not a credit, so its cash value is your marginal rate times the amount - a few hundred dollars for a typical car loan, not five figures.

What survives all of those disqualifications is deduction one. Any self-employed driver with a car loan, new or used, foreign or domestic, can deduct the business-use share of the interest on Schedule C. That is the part more drivers are missing, and it applies every year, not just through 2028.

Bottom line

Check the boring deduction first. Pull your loan statements, find the interest paid, multiply by the business-use percentage from your log, and put it on Schedule C. Then test the new deduction against four facts: new vehicle, US final assembly, loan after 2024, mostly personal use.

Both answers depend on a number only you can produce, which is the share of your miles that were work. GigOdo logs those miles automatically and keeps the yearly totals your preparer needs, free and with no trip cap. More posts on filing sit in the taxes and deductions hub, including quarterly tax estimates for gig drivers.

FAQ

Sources: 26 U.S.C. sec. 163(h)(4); IRS, Working Families Tax Cuts: deductions for working Americans and seniors; IRS FS-2026-04, Schedule 1-A; Proposed regulations, Car Loan Interest Deduction, 91 FR (Jan. 2, 2026); 2025 Instructions for Schedule C (Form 1040); Rev. Proc. 2019-46; Instructions for Form 1098-VLI (draft); IRS Topic 554; IRS Notice 2026-10. Vehicle assembly can be checked with the NHTSA VIN Decoder. This article is general information, not tax advice; the January 2026 regulations are proposed rather than final, so confirm your position with a tax professional.